TABLE 5.
Isolation of PRRSV from BAL and titration of virus from lung tissue and number of cells with PRRSV antigen, as determined by IHC
| Group | PRRSV result at the following necropsy date:
|
||||||||
|---|---|---|---|---|---|---|---|---|---|
| Day 3
|
Day 10
|
Day 28
|
|||||||
| BAL (no. pos.)a | IHC
|
BAL (no. pos.) | IHC
|
BAL (no. pos.) | IHC
|
||||
| No. pos.b | No. of cellsc | No. pos. | No. of cells | No. pos. | No. of cells | ||||
| A | 3/6 | 4/6 | 101.8 | 6/6 | 3/6 | 91.5 | 3/8 | 1/8 | 87.3 |
| B | 4/6 | 4/6 | 167 | 5/6 | 5/6 | 17.5 | 1/8 | 1/8 | 0.4 |
| Cd | 2/6 | 6/6 | 8.2 | 5/6 | 0/6 | 0 | 0/8 | 3/8 | 208.9 |
| D | 0/6 | 0/6 | 0 | 0/6 | 0/6 | 0 | 0/8 | 0/8 | 0 |
| E | 0/6 | 0/6 | 0 | 0/6 | 0/6 | 0 | 0/8 | 0/8 | 0 |
| F | 3/6 | 5/6 | 554 | 6/6 | 4/6 | 28.3 | 0/8 | 1/8 | 0.4 |
| G | 0/6 | 0/6 | 0 | 0/6 | 0/6 | 0 | 0/7 | 0/8 | 0 |
a
Number of pigs positive for PRRSV in BAL/total number of pigs in group. pos., positive.
b
Number of pigs with PRRSV antigen as detected by IHC/total number of pigs in group.
c
Average number of positive cells (mean number of positive cells in three lung sections) per pig with PRRSV antigen, as detected by IHC.
d
Group C received PRRSV on day −10 and M. hyopneumoniae on day 0 and so is not matched with the other groups with respect to the number of days after inoculation with PRRSV.